The main problem with the current meta for multi-boxing is just how squishy archon wizard is, BUT it can be played exactly like you attempted to play the twister setup but without needing to pull to walls and such.

Caldesian's at ~ 75 would push you to around GR 80-85 with your current setup, the beauty of your setup is that it can be develop into a support/dps LON thorns barb as one of your other toons which will bring your RG/elite kills increased speed.